Le 24/11/2025 à 20:15, Thomas Gleixner a écrit :
On Tue, Nov 25 2025 at 01:37, kernel test robot wrote:
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/rseq
head: 21782b3a5cd40892cb2995aa1ec3e74dd1112f1d
commit: abc850e7616c91ebaa3f5ba3617ab0a104d45039 [25/39] rseq: Provide and use
rseq_update_user_cs()
config: powerpc-randconfig-002-20251124
(https://download.01.org/0day-ci/archive/20251125/[email protected]/config)
compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project
7cbf1a2591520c2491aa35339f227775f4d3adf6)
reproduce (this is a W=1 build):
(https://download.01.org/0day-ci/archive/20251125/[email protected]/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes:
https://lore.kernel.org/oe-kbuild-all/[email protected]/
All errors (new ones prefixed by >>):
In file included from kernel/rseq.c:75:
include/linux/rseq_entry.h:132:3: error: invalid operand for instruction
unsafe_get_user(start_ip, &ucs->start_ip, efault);
^
include/linux/uaccess.h:606:2: note: expanded from macro 'unsafe_get_user'
arch_unsafe_get_user(x, ptr, local_label); \
^
arch/powerpc/include/asm/uaccess.h:458:2: note: expanded from macro
'arch_unsafe_get_user'
__get_user_size_goto(__gu_val, __gu_addr, sizeof(*(p)), e); \
^
arch/powerpc/include/asm/uaccess.h:282:2: note: expanded from macro
'__get_user_size_goto'
__get_user_size_allowed(x, ptr, size, __gus_retval); \
^
arch/powerpc/include/asm/uaccess.h:273:10: note: expanded from macro
'__get_user_size_allowed'
case 8: __get_user_asm2(x, (u64 __user *)ptr, retval); break; \
^
arch/powerpc/include/asm/uaccess.h:256:4: note: expanded from macro
'__get_user_asm2'
" li %1+1,0\n" \
^
<inline asm>:7:5: note: instantiated into assembly here
li 31+1,0
Definitely not a problem of tip core/rseq. It just ends up in
__get_user_asm2() and then the compiler gets unhappy about the PowerPC
inline assembly for whatever reason.
I see it is a CLANG build.
CLANG might be less flexible, can you test with following change ?
diff --git a/arch/powerpc/include/asm/uaccess.h
b/arch/powerpc/include/asm/uaccess.h
index 4f5a46a77fa2..33d5f7ade254 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -253,7 +253,7 @@ __gus_failed:
\
".section .fixup,\"ax\"\n" \
"4: li %0,%3\n" \
" li %1,0\n" \
- " li %1+1,0\n" \
+ " li %L1,0\n" \
" b 3b\n" \
".previous\n" \
EX_TABLE(1b, 4b) \
Thanks
Christophe
